Superheater boiler



Jan. 14, 1930. D. s. JACOBUS SUPERHEATER BOILER Filed Sept. 14, 1925 INVENTOR.

% J *M ATTORNEYS. 1

\NIIiIIIIHIL Patented Jan. 14, 1 930 UNITED STATES rarsrorrlcn DAVID s. JACOBUS, or JERSEY CITY, NEW JERsEY, Assre'EO-R TO THE 'BABOOOK & WIR- cox COMPANY, OE BAYONNE, NEW JERSEY, A CORPORATION OF NEW JERSEY SUPERHEATER BOILER Application filed September 14, 1923; Serial No. 662,622,

My present invention relates to steam boilers provided with superheatersand will be best understood from the following descrip tion and the annexed drawings, in which Figure l is a vertical sectional elevation of a well-known type of water tube boiler which I have adopted for purposes of illustration and embodying my invention; Fig. 2 is a view, partly in section on line 2-2 of Fig. 3, 1c of a damper which may be employed; Fig. 3

is a section'taken on the line 33 of Fig. 2;

Fig. 4 is a plan view of an element of said damper, and Fig. 5 is an endwise view of said element. Like reference characters indicate like parts in the several views;

In the illustrative type of boiler-shown 1n Fig. 1', the uptake headers and downtake headers 31 are connected by horizontally inclined water tubes divided into, two banks, the lower bank in this form consisting of two rows of tubes 34, thetwo rows being spaced, as shown. 25 tom row of the tubes 34 from the downtake Extending along the top row of tubes 34 is a baffle 36 which terminates about midway of the tubes 34. A cross baffle 37 is inclined to provide a gradually restricted pass across the right-hand end of the tubes 33 of the upper bank, and vertical baffles 38 and 39 provide cross passes, the last pass leading to the main gas outlet 40.

Above the first and second passes of the main bank of water tubes 33 is a primary superheater having U-tubes 41 connected to cross headers in the usual way, these headers being connected to the steam and water drum 32. In the space between the baffles and 36 is a secondary superheater having superheater tubes 42, connected to headers 45 and 46 extending across the boiler. The inlet header of the lower superheater is connected by a pipe 43 with the outlet header of the upper superheater.

In the baffle 36 above the secondary or lower superheater is a damper denoted generally by 50, by means of which a regulated quantity of the furnace gases may be allowed to pass across the tubes 42 of the secondary A batlle 35 extends along the bot-- headers 31 toward the uptake headers 30.

superheater. This damper conveniently be constructed as follows Cast iron blocks 51 are crowded with ports 52'of a width equal approximately to the distance between the Theblocksthus placed form aseat for the valye 53, the latter each having a tongue 54 which fits 1n slots 55 in the" blocks; 'The valve 53 comprises transverse portions 53 which register with the ports 52 and is provided with collars 56 spaced, say, at every five I tubes. Throughthese collars passes a cross rod'57. The valve 53 may beadjusted with respect to the rod 57 by means of set screws 58 in thecollars- It will-be thusseenthat the longitudinal movement of the rod 57' will move the valve 53 to-vary thesize of the openings between the tubes 34 and thus regulate the amount of furnace gases passing there through. V I

In use, the gases passupwardfrom the furnace and are directed by the baiiiei35 into the pass formed between the baifle 37 and the uptake headers 30, whence they flow over the upper or primary superheater and then back the same space between the baffles 38 and 39 and downtake headers 31, to the main 'ga's outlet. Thus, it willbe seen that when-the damper 1s open, two paths are provided for the gases, the gases passing through the superheater uniting in the common third pass formed by the bafiies 38 and39 and downtake V headers 31. 7

In the arrangement described, theregula tion of thedamper 50 will controlthe degree of superheat to be-obtained inthe secondary; v superheater. The steam from the steamand 1 water drum32 will first be superheated 1n the primary superheater 41 bygases which will be seen that the gases passing over the superheater located among the water tubes are taken from the en'tirewidth of the furnace chamber, so that there is no unbalancing effect, no matter to what degree the flow of these gases may be regulated. It Will also be observed thatthe gases from the superheater chamber, which, of course, will have considerable'heat therein, will unite with the gases passing downwardly through the sec- 0nd pass from the primary superheater, and will flow uniformly over the ends of all the Water tubes, so that there is no tendency to heat the tubes on one-side of the boiler differently from those on the other side, as might be the case if all the gases from the super- 'heater chamber are directedagainst some 7 "of the tubes at one side of the boiler only.

By the arrangement above described,a large amount of superheating surface may be supplied for the primary superheating of the steam, and then a relatively small amount subjected to relatively hot gases which will raise the steam to the desired degree of superheatwhich may be controlled by thedamper 50. I a r V 'll hile I have shown my invention applied to a boiler of a certain type, it will be understood that its application may be widely varied.

'This application is a continuation in part of divisible subject matter of my copending application, Serial No. 576,188.

Iclaim: 1 Z :1. A water tube boilerhaving'a primary superheater connected to the boiler and a,

secondary superheater connected in. series with the primary superheater, and means to direct a portion of the furnace gases over the primary superheaterfto the exclusion of the secondary superheater and another portion of the furnace gases over the secondary superheater to theexclusionof the primary superheater, and the combined portions of the gases from the respective superheaters over a portion 0f the heating surface of the boiler.

2. A Water tube boiler having'a primary 7 superheater connected to the boiler and a secondary superheater connected in series with the primary superheater, means to di rec'tfla portion of the furnace gases over the primary'superheater to the exclusion of the secondary superheater and another portion of the furnace gases over the secondary superheater to the exclusion of the primary superheater, and the combined portions of the gases from the respective superheaters over a portion of the heating surface of the boiler, and means to vary the ratio of the two portions.

3. A Water tube boiler having a primary superheater connected to the boiler and a secondary superheater connected in series with the primary superheater, and means to direct a portion of the furnace gases over the primary superheater to the exclusion of the secondary superheater and another portion of the furnace gases over the secondary superheater to the exclusion of the primary superheater, and the combined portions of the gases from the respectivesuperheaters over a portion of the heating surface of the boiler, the boiler and the superheater being arranged so that the secondary superheater will be subjected to the hotter gases.

4. A water tube boiler having a primary superheater connected to the boiler and a secondary superheater connected in series with the primary superheater, means to direct a portion of the furnace gases over the' primary superheater to the exclusion of the secondary superheater, and another portion of the furnace gases over the secondary superheater to the exclusion of the primary superheater, and the combined portions of the.

gases from the respective superheaters over a portion of the heating surface of'the boiler,

and means to vary the ratio of the two portions, the boiler and the superheater being arranged so that the secondary superheater will be subjected to the hotter gases.

DAVID S. JACOBUS. 

